Artificial membranes precisely imitating the biological functions of ion channels and ion pumps have attracted significant attention to explore nanofluidic energy conversion. Herein, inspired by the cyclic ion transport for the photosynthesis in purple bacteria, a bilayer inorganic membrane (TiO₂/AAO) composed of oxide semiconductor (TiO₂) mesopores on anodic alumina (AAO) macropores is we developed. This inorganic membrane achieves the functions of ion channels and ion pumps, including the ion rectification and light-powered ion pumping. The asymmetric charge distribution across the bilayer membrane contributes to the cationic selectivity and ion rectification characteristics. The electrons induced by ultraviolet irradiation introduce a built-in electric field across TiO₂/AAO membrane, which pumps the active ion transport from a low to a high concentration. This work integrates the functions of biological ion channels and ion pumps within an artificial membrane for the first time, which paves the way to explore multifunctional membranes analogous to its biological counterpart.

中文翻译：

---

用于仿生离子整流和光能离子泵浦的阳离子选择性氧化物半导体介孔膜

精确模仿离子通道和离子泵的生物功能的人造膜在探索纳米流体能量转换方面引起了广泛关注。在此，受紫色细菌光合作用循环离子传输的启发，我们开发了一种由氧化物半导体（TiO ₂）中孔和阳极氧化铝（AAO）大孔组成的双层无机膜（TiO _{2 /AAO）。}这种无机膜实现离子通道和离子泵的功能，包括离子整流和光动力离子泵。跨双层膜的不对称电荷分布有助于阳离子选择性和离子整流特性。紫外线照射诱导的电子在 TiO 上引入了一个内置电场₂ /AAO膜，将活性离子传输从低浓度泵到高浓度。这项工作首次将生物离子通道和离子泵的功能集成到人造膜中，为探索类似生物膜的多功能膜铺平了道路。